Over the past two years, the fees that airlines have figured out have been seemingly endless. Baggage and cancellations are just the tip of the iceberg. Now, passengers are stuck with a healthy dose of fee fatigue, but the good news is that there doesn’t seem to be anything left for which to charge – except maybe access to the flotation devices in the event of an emergency.

Well, don’t get too comfortable.

Despite having had a fantastic year in 2010, there are already grumblings in the airline industry about increasing fuel costs. This means, of course, that the additional expense will have to be passed along to us, the passengers, in some form. Even though we may not be able to think of (realistic) charges to levy, it seems as though the airlines have this under control, according to an article on MSN Money. Already, 19 different a la carte charges exist, and they are set to earn the airlines $22 billion worldwide for 2010.

So, the airlines want more of your money. How are they going to get it? Well, here are five ideas for them:1. Pay to talk to someone: do you need to talk to a ticket agent, or would you merely prefer to do so? Don’t worry; this perk option isn’t going away. You will have to pay for it, though, according to Jay Sorensen of IdeaWorks, a company involved in tracking consumer trends. The good news is that the only people in line will be shelling out cash for the privilege, so you won’t have to wait too long.

Alternative: if you want to talk to someone that badly, and are willing to pay for it, try online dating.

2. Pay to tote your own bags: are you ready to pay to avoid paying check-in fees? Spirit is already doing it, and most airlines in the United States have said they aren’t going to head in that direction. But, American Airlines, United Airlines and US Airways, according to MSN Money, “essentially have,” calling it “priority boarding or choice seating.” If you get a better seat you have a spot for your bags on a crowded flight. Otherwise, you’re stuck hoping for the best.

Alternative: make friends with a frequent flier.

3. Pay to take your bags overseas: we’re getting used to paying for checking the first bag on domestic flights, but we’ve been spared the humiliation when traveling internationally. That could change, though, especially since there’s money to be made.

4. Pay to deal with your kids: so far, an infant on your lap has gotten a free ride, but this discomfort could cost you. George Hobica, of AirfareWatchdog, thinks this one could be on the list for 2011. “If the government doesn’t act to ban lap children,” he told MSN Money, “we might see the airlines make a move.”

Alternative: birth control.

5. Pay to be like everything else: back when I had platinum status on one airline and gold on another (in the same year), I came to appreciate the benefits – and this was even before the ancillary fee trend took hold. Now, status is worth even more, because it alleviates some of this fee pressure. The MSN Money article mentions that the hit could be targeted at non-elite loyalty program members, but I wouldn’t be shocked to see even the airlines’ best customers lose some of the perks someday.